You are not alone in wanting to find the right ring size to go with your ring without your significant other knowing.

Luckily, our experts have spoken to us about all the different ways to subtly measure your partner’s ring size.


Find your ring size using our free ring sizer tape measure 

We'll send you a free tape measure to get you started.

  1. Take the ring size chart and place your ring over the circle that aligns with the inside edge of your ring. Make sure you are using a ring that fits the same finger (and hand) as the ring you want to purchase.

  2. Cut out the ring sizer and then cut a slot on the dotted line. Wrap the ring sizer tightly around the widest part of the intended finger with the numbers showing toward you. Insert the arrow-end through the slot you cut. Your ring size is the number that lines up with the slot.


How To Measure Ring Size Using String, Paper, And A Ruler  

  • Step 1: Cut a strip of paper and wrap it around your partner's left finger with one hand and the string around his or her right index finger with the other hand.

  • Step 2: Identify the point where the end meets the string and make a mark.

  • Step 3: Lay the string flat and measure the length of the mark.

  • Step 4: Compare this measurement to our ring size chart to find the closest fit.



6 Ways to Measure Ring Size Without Your Partner Knowing       

  1. Be Subtle

    If you are planning a surprise proposal for your girlfriend, you can pretend to be buying a ring for your mom, sister, grandma, or even yourself. You might need to give her a hint (like asking about her favorite color) to encourage her to be on the lookout for the "surprise" purchase. If your partner doesn't own a wedding ring, you can always use the same ring you're wearing to fake the look. Then, ask your partner to try it on and give you an honest opinion. The next time they suggest getting engaged, you can go all in and say "yes!


  2. Ask Friends 

    If you know how to find the right ring size for your fiancée, here’s a fun tip from an engagement ring expert. He suggests asking a friend about her ring size. And if that fails, he has another suggestion. Ask a friend to “have fun” with her while he helps her pick the perfect engagement ring.


  1. Borrow A Ring

    Another strategy is to borrow one of your partner’s rings for a day. You do need to be careful with this tactic because it might backfire. Make sure you borrow a ring that they won’t notice is missing and that’s similar in size to your partner’s left ring finger.  


  1. Leave A Trace 

    If your partner has an engagement ring, it's time to buy a new pair! Don't throw out your partner's ring – just make a circle, mark off both sides, and cut along those lines. This is a great way to determine the size of the ring, without having to measure with tape.

    Jewelry Specialists can usually figure out the measurement of the inner diameter from your sketch. You can be sure that the measurements are accurate by using our ring size conversion chart.


  1. Enlist An Engaged Friend

    If you're not sure about your partner's ring size, find out from them. You can also use this as an opportunity to ask them what they thought of the friend's engagement ring. You can try on the ring privately with your partner and ask them for feedback.


  1. Compare Fingers

    This method of measuring rings is a bit less accurate, but if you are desperate, go ahead and give it a shot! Her left ring finger might be as big as your pinky.   



    6 Ring Size Tips and Facts 

    1. Our dominant hand tends to be slightly bigger, so make sure you are measuring your partner’s left ring finger.

    2. If you haven’t gotten your partner’s exact measurement, err on the larger size so the ring is sure to slip over the knuckle of your partner’s ring finger when you propose.  

    3. The most common women’s ring size is 6 to 6.5. 

    4. The most common men’s ring size is 10. 

    5. Wider bands have a tighter fit than thinner bands, so if you borrow a ring to measure, try to make sure that it is the same width as the ring you plan on purchasing.

    6. Finger size changes a little throughout the day because of temperature, activities, etc. When warm, fingers tend to expand slightly. When cold, fingers tend to shrink. Most people find they have puffier fingers in the morning, but that their fingers shrink to their normal size during the day.  


    Ring Sizing FAQs  

    In the United States and Canada, rings are measured by the diameter of the innermost edge of the band. We also measure in millimeters and convert the measurement to the nearest half size.


    The shape of the rings inside edge determines if it is a comfort fit ring or a standard fit ring. Comfort fit rings have a flat inside edge that allows for better grip while you're putting on the ring.

    Comfort fit styles are a great alternative to conventional rings, especially for those who have issues slipping them on and off their fingers. The beveled or curved inside edge allows for easy sliding and removal and is ideal for those with wide knuckles or hands that swell.


    Trendolla Jewelry offers free ring sizing within the first 60 days for most rings. This is to ensure customers get the perfect fit. Trendolla Jewelry also offers free 30-day returns. If for any reason you are not satisfied with your purchase, you can return it for an exchange or full refund.


    When a ring is resized, the jeweler will cut through the back of the band and either remove or add metal to change the size of the

    The best course of action is to return the ring if you need to get a new size.

    While a ring size can be quite important, it can be easily compromised when a new design is proposed that would lead to an extreme resize.


    You can find the measurements of a ring you already have by taking a ruler and measuring straight across the center from edge to edge.

    Using the ruler, document the diameter in millimeters. Once you know the measurement, multiply it by 3.14 to get the circumference. Use that figure to match it up with our sizing chart to find the size of a ring you need.


    You can find the measurement of a ring you already have by taking a ruler and measuring directly in the middle of the ring.

    With a tape measure or a string measure, find the diameter in millimeters. Take that number 3.14 times to find the circumference of your ring.

    For the most accurate ring size measurement, use a tape measure.


    Mystery boxes are becoming very popular in the jewelry industry. As a matter of fact, in the last few years, they have become the go-to gift for many people who want to get a gift but don’t know exactly what they want.

    To build urgency is to create mystery. This means not telling your boyfriend/girlfriend what the product is going to be. Mystery creates a sense of curiosity and intrigue around the box. People will want to find out what’s inside before they can buy it. So, it's also a good way to buy a mystery box for your boyfriend/girlfriend.


    Final Thoughts  

    The best way to get the right ring size is to have your partner’s ring finger sized by a professional jeweler. Using one or several of the methods above will result in a close approximation, but there is always a chance that your measurement may be off a little bit.

    For customers who want their engagement ring to fit perfectly, we highly recommend going to a jeweler to get an accurate size before purchasing a ring. Most of our ring sizes can be altered in the future.


    March 16, 2022 — Erica Zheng

    We design for life, create for the world.

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